Method of reporting measurement report triggering events and related communication system

Abstract

A communication system includes a user equipment and a network having a serving cell and a neighboring cell. The user equipment receives network parameters from the network and stores a first UE-defined criteria associated with signals measured from the serving cell and the neighboring cell and a second UE-defined criteria associated with individual offsets of the serving cell and the neighboring cell. When the entering/leaving condition of a specific measurement report triggering event is satisfied, the user equipment is configured to report the specific measurement report triggering event to the network only when there is a considerable difference between measurement results of the neighboring cell and the serving cell and after determining that the network parameters have been set adequately.

What is claimed is: 
     
         1 . A method of operating a user equipment (UE) for reporting measurement report triggering events to a network, comprising:
 storing a first UE-defined criteria and a second UE-defined criteria in the user equipment, wherein the first UE-defined criteria is associated with signals measured from a first cell and a second cell within the network, and the second UE-defined criteria is associated with individual offsets of the first cell and the second cell;   the user equipment receiving a plurality of network parameters from the network;   the user equipment acquiring a first measurement result of the first cell and a second measurement result of the second cell when camping on the first cell;   the user equipment determining whether a specific measurement report triggering event is satisfied according to the first measurement result, the second measurement result, and at least one of the plurality of network parameters;   the user equipment determining whether the first UE-defined criteria or the second UE-defined criteria is satisfied according to the first measurement result, the second measurement result, and at least one of the plurality of network parameters; and   when the specific measurement report triggering event is satisfied, the user equipment reporting the specific measurement report triggering event to the network at determining that at least one of the first UE-defined criteria and the second UE-defined criteria is satisfied.   
     
     
         2 . The method of  claim 1 , wherein the specific measurement report triggering event is any of Events A1-A6 and B1-B2 defined in a 3rd Generation Partnership Project (3GPP) specification TS 36.331. 
     
     
         3 . The method of  claim 1 , wherein the first measurement result and the second measurement result are acquired in an intra-frequency measurement, an inter-frequency measurement, or an inter-RAT measurement of the first cell and the second cell defined in a 3GPP specification TS 25.331. 
     
     
         4 . The method of  claim 1 , further comprising:
 setting a first UE-defined threshold value, wherein the first UE-defined criteria is satisfied when an absolute value of a difference between the first measurement result and the second measurement result is greater than the first UE-defined threshold value.   
     
     
         5 . The method of  claim 1 , further comprising:
 setting a second UE-defined threshold value, wherein:   the plurality of network parameters includes a cell specific offset of the first cell and a cell specific offset of the second cell; and   the second UE-defined criteria is satisfied when an absolute value of a difference between the cell specific offset of the first cell and the cell specific offset of the second cell is smaller than the second UE-defined threshold value.   
     
     
         6 . The method of  claim 1 , wherein the plurality of network parameters includes a frequency specific offset of a frequency of the first cell, a frequency specific offset of a frequency of the second cell, a cell specific offset of the first cell, a cell specific offset of the second cell, a hysteresis parameter for the specific measurement report triggering event, or an offset parameter for the specific measurement report triggering event. 
     
     
         7 . The method of  claim 1 , further comprising:
 the specific measurement report triggering event is satisfied when.   
     
     
         8 . A communication system for reporting measurement report triggering events comprising:
 a network having a first cell and a second cell; and   a user equipment including:
 a network connectivity unit configured to receive a plurality of network parameters and a measurement configuration from the network; 
 a measuring unit configured to acquire a first measurement result of the first cell and a second measurement result of the second cell according to the measurement configuration when the user equipment is camping on the first cell; 
 a memory unit for storing a first UE-defined criteria and a second UE-defined criteria, wherein the first UE-defined criteria is associated with signals measured from the first cell and the second cell, and the second UE-defined criteria is associated with individual offsets of the first cell and the second cell; and 
 a processing component configured to:
 determine whether a specific measurement report triggering event is satisfied according to the first measurement result, the second measurement result, and at least one of the plurality of network parameters; 
 determine whether the first UE-defined criteria or the second UE-defined criteria is satisfied according to the first measurement result, the second measurement result, and at least one of the plurality of network parameters when the specific measurement report triggering event is satisfied; and 
 instruct the measuring unit to report the specific measurement report triggering event to the network when the specific measurement report triggering event is satisfied and at least one of the first UE-defined criteria and the second UE-defined criteria is satisfied.